Just a question on gland lure color and why mine is darker. I have red, grey, and coyote gland lures I made. All glands I collected from my own catches, did my best to gather good clean ingredients, and each species batch has a single liver from one of the specimens in it. I ground and jarred all separately, did not separate genders. These batches are 2 years old now, in pints, kept sealed in an old non working dorm fridge in an unheated shop. I did not stir enough in the first six months from what I read here, but they smell useable to me, and have made catches with them. Each time I go to check on them or get some to use, the top layer is darker and when stirred in it makes the lure grey or greyer in color. I am curious how to stop this on the future batches, I tried to give as much info as possible in this lengthy post, thanks in advance.

The top of your lure gets exposed to air in the jars.

Yep, exposure to air will darken aged glands.

Fair enough, but I have gland lures I bought from others that are 2 and 3 years ago that do not have this happening. I can only figure I obviously lack something in my formulation to keep this from happening. Does anything prevent this darkening or do I need to handle it differently to avoid the color change?

Raw handled glands or meats will continue to darken with age. This is due to the nature of decomposition and the multiplying of bacteria in the organic tissue. That is the effect of oxygenation of the material. Good lure making can be a long trial and error process over many years.